Re: Packet injection with ath9k

[Roberto Riggio <roberto.riggio@create-net.org>]

Hi,

well, that is what i wanted to understand. These are the struct
that I'm using to compose the rediotap header:

struct ieee80211_radiotap_header {
     u_int8_t    it_version;
     u_int8_t    it_pad;
     u_int16_t       it_len;
     u_int32_t       it_present;
} __attribute__((__packed__));

struct click_radiotap_header {
     struct ieee80211_radiotap_header wt_ihdr;
     u_int8_t    wt_rate;
     u_int8_t    wt_txpower;
     u_int8_t        wt_rts_retries;
     u_int8_t        wt_data_retries;
};

The flags are set in order to take into account the fields that I
specify. But i do not know at which point the frame are
dropped.

R.

On 05/07/2010 06:35 PM, Gábor Stefanik wrote:
> Hi!
> Are you sure it is not your injector that is having alignment issues?
> AFAIK the radiotap parser explicitly uses endianness-aware function
> everywhere.
>
> On Fri, May 7, 2010 at 6:13 PM, Roberto Riggio
> <roberto.riggio@create-net.org>  wrote:
>    
>> Hi,
>>
>> I'm writing an application to inject traffic over a wireless interface. This
>> app
>> is working fine on an x86 machine. However if i compile the same app for
>> an arm platform, no frame are sent over the wireless interface (ath9k).
>>
>> I'm guessing that this is because of some alignment issues but i cannot
>> track
>> the piece of code that is actually parsing the frame. I've found the
>> __ieee80211_parse_tx_radiotap in net/mac80211/tx.c function, but it is
>> not called when i try to inject some traffic, so the frame are dropped
>> before that.
>>
>> Any hints?
>>
>> Thanks
>> R.
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>>      
>
>
>